根据短文理解，选择正确答案。

Buzz! Buzz! Buzz!

This is the song of the bee.

His legs are yellow;

A happy, good fellow,

And yet a great worker is he.

On days that are sunny

He's getting his honey(蜂蜜);

On days that are cloudy

He's making his wax(蜜蜡);

On pinks and on lilies,

Buzz! Buzz! Buzz!

From morning's first light

Till(直到)the coming of    ⑶     .

He's singing and working

The summer day through.

已知等比数列{a_n}的各项均为正数，a₂=8，a₃+a₄=48．

求数列{a_n}的通项公式；

据报道，2012年4月，湛江开发区某中学发现疑似风疹病例，市疾控中心马上派出专人到现场进行流行病学调查，填写传染病报告卡．下列有关叙述正确的是（　　）

科技小组计划选一块600平方米的实验田．（从左往右填表）

____ 

仔细观察这个表格，你发现了什么？

我发现____ ．